// Some IE-compatibility functions, like forEach

// This code from MDN
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/forEach
if ( !Array.prototype.forEach ) {  
  
  Array.prototype.forEach = function( callback, thisArg ) {  
  
    var T, k;  
  
    if ( this == null ) {  
      throw new TypeError( " this is null or not defined" );  
    }  
  
    // 1. Let O be the result of calling ToObject passing the |this| value as the argument.  
    var O = Object(this);  
  
    // 2. Let lenValue be the result of calling the Get internal method of O with the argument "length".  
    // 3. Let len be ToUint32(lenValue).  
    var len = O.length >>> 0; // Hack to convert O.length to a UInt32  
  
    // 4. If IsCallable(callback) is false, throw a TypeError exception.  
    // See: http://es5.github.com/#x9.11  
    if ( {}.toString.call(callback) != "[object Function]" ) {  
      throw new TypeError( callback + " is not a function" );  
    }  
  
    // 5. If thisArg was supplied, let T be thisArg; else let T be undefined.  
    if ( thisArg ) {  
      T = thisArg;  
    }  
  
    // 6. Let k be 0  
    k = 0;  
  
    // 7. Repeat, while k < len  
    while( k < len ) {  
  
      var kValue;  
  
      // a. Let Pk be ToString(k).  
      //   This is implicit for LHS operands of the in operator  
      // b. Let kPresent be the result of calling the HasProperty internal method of O with argument Pk.  
      //   This step can be combined with c  
      // c. If kPresent is true, then  
      if ( k in O ) {  
  
        // i. Let kValue be the result of calling the Get internal method of O with argument Pk.  
        kValue = O[ k ];  
  
        // ii. Call the Call internal method of callback with T as the this value and  
        // argument list containing kValue, k, and O.  
        callback.call( T, kValue, k, O );  
      }  
      // d. Increase k by 1.  
      k++;  
    }  
    // 8. return undefined  
  };  
}  

